Are these microphone connections okay?

Discussion in 'The Projects Forum' started by shikhar623, Mar 5, 2015.

  1. shikhar623

    Thread Starter Active Member

    May 9, 2009
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    Hello Friends.
    This question may seem to be very simple but kindly answer it.
    I have got one mic (pulled off from old headphones) and a 3.5 mm jack.
    If I connect red-red, and yellow-yellow marked terminals will i be able to use this mic with my PC?
    Or do I need some (additional) power circuitry for mic? IMG_20150305_150006_HDR.jpg earbud-stereo-jack-plug-wiring.jpg IMG_20150305_150006_HDR.jpg earbud-stereo-jack-plug-wiring.jpg
     
  2. R!f@@

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    Apr 2, 2009
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    Might work or not.
     
  3. shikhar623

    Thread Starter Active Member

    May 9, 2009
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    What do I need to do in order to make it work?
     
  4. R!f@@

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    First check them if it works without a circuit.
    I bet if properly wired it will work.
    I never tried dismantling a PC mic before so cannot say for sure
     
  5. Dodgydave

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    Jun 22, 2012
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    microphones are mono, so you need to use the earth Orange and tip green pins of the stereo plug.
     
    Last edited: Mar 5, 2015
  6. shikhar623

    Thread Starter Active Member

    May 9, 2009
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    So Red wire of mic should be connected to red of Jack, yellow wire of mic to the green of the Jack and yellow of Jack to the ground.
    Am I getting it Correct?
     
  7. djsfantasi

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    Apr 11, 2010
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    You haven't told us to what you are connecting the microphone. That may have some bearing as to what pins on the jack are correct. Also, if you have a choice, a mono jack and plug might be better.

    Please tell us what you are connecting to. Supply a schematic if you have one.
     
  8. MikeML

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    Oct 2, 2009
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    PC Mics are an Electret element with a built-in Preamp. The PC backfeeds a bias current to the mic, and the load resistor across which the audio appears is inside the PC soundcard. If using the mic with other than a PC, all of the stuff inside the sound card has to be duplicated...
     
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  9. shikhar623

    Thread Starter Active Member

    May 9, 2009
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    Thanks MikeML,
    I intend to use with PC. So will the arrangement in #6 above suffice?
     
  10. R!f@@

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    Problem is if the PC takes a stereo mic or a mono mic ?
     
  11. MikeML

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    Only two connections go to the mic element, signal, and shield.
    Signal
    goes to both tip and ring
    Shield goes to sleeve

    I just Ohmmed my PC mic that I use for Skype. 0Ω between tip and ring. ~1200Ω either tip to sleeve or ring to sleeve.
     
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  12. shikhar623

    Thread Starter Active Member

    May 9, 2009
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    How to find that? These are pink and green color 3.5mm female Jacks on my PC. One for headphones and other for mic.
     
  13. R!f@@

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    Try Post #11 for a start.
     
  14. shikhar623

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    May 9, 2009
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    By sleeve you mean the orange one on the Jack (in the pic)?
     
  15. MikeML

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    In your pic, grn is tip, red is ring, org is sleeve
     
  16. Dodgydave

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    Orange and Green, as in post#5
     
  17. shikhar623

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    May 9, 2009
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    And how to differentiate between shield and signal terminal on th e mic?
     
  18. MikeML

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    The cable going down the mic boom should be coaxial shielded single-center-conductor, but it is hard to see that from your picture.

    Try connecting the mic both ways. It should work one way, but not work the other. Connecting it backwards wont hurt anything, just wont work as a mic...
     
  19. shikhar623

    Thread Starter Active Member

    May 9, 2009
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    What about now. Can you make out.
     
  20. Canobi

    New Member

    Mar 4, 2015
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    I'm still running XP so might not be the same for you, but in the sound options there's a signal boost for passive mics, just tick the little box and it should work fine, though you may need to adjust the gain so the signal isn't distorted.

    Your computer will see the audio signal as mono as your only using one side of a pair. The incoming signal might be L or R biased due to using a stereo jack as the computer may think one side isnt working.
     
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